Plumbing adaptor for air admittance valve



FIG. 1 is a front side elevation view of a plumbing adaptor showing our new design, the back side being a mirror image;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right end elevation view thereof; and,

FIG. 5 is a left end elevation view thereof. 

The ornamental design for a plumbing adaptor for air admittance valve, as shown and described. 